Mitering corners shows an understanding of woodworking, a respect for materials and the project.
It demonstrates a respect for the customer and offers a little more for their money.

It takes a little more time, and that is why the
high production builders such as Savoy and Martin use butt joints.Slap it together and belt sand the corner.

I take about 4 minutes a year to state the position on mitred vs butt joints. I'll make that up tonight and play a few more minutes.

Meanwhile,go ahead and continue to extole the (lack of) virtues of a, no talent needed, butt joint.

There are Cajun builders who miter and make fine boxes. I know of no Euro or Quebec boxes that have butt joints.